X2 what bGreene just said.
So many things can effect the not only the time it takes to get on plane but also the performance. Boat weight (a gallon of water weighs roughly 8 1/4 lbs). If the foam in your hull is saturated that can add hundreds of extra lbs of weight to the hulls weight.) Cooler filled with ice and soda and beer? Add up the weight from that. Tackle? Number of people, amount of fuel in the tank, extra fuel tank(s). Every pound equals a longer time and the harder your engine has to work. Even the distribution of the weight has an effect. Then there's the engine itself. Is your fuel/water filter clean? Are the carbs clean? Fresh plugs? Lower unit have the proper amount of clean oil? What about the prop? What pitch? cupped? material it's made from? Dents or dings? number of blades?
The point is that it's almost impossible to second guess what your particular boats' specs are. Give us some more info please.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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